count = 0

while true do
  shell.run("clear")
  print("You are having a " .. count .. " GP)
  event, argument = os.pullEvent()

   if event =="redstone" then
     if redstone.getInput("back") then
      count = count + 1
     end
     if redstone.getInput("bottom") then
      count = count - 1
     end
   elseif event == "char" and argument == "q" or redstone.getInput("left") then break end
end